[Webkit-unassigned] [Bug 159475] Implement IntersectionObserver

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=159475

--- Comment #1 from Jeffrey Gilbert <jeffreytgilbert at gmail.com> ---
Update: Chrome has a working implementation out now as of Chrome 51. The next Chrome release will also introduce a throttling mechanism on Flash which will greatly impact Flash functionality across site publishers. Linked in the comments are some of the implementation details for the Chrome feature.

Safari currently has no ability to report behavior using Flash as it has already been throttled and when it's used, it's inaccurate upon initial page load until the Flash player has been scrolled in and out of view so it's forced to change state. Geometric polling does work, but it's an expensive operation to call from javascript resulting in reduced battery life from higher cpu usage. 

Billing standards for advertisements are rapidly moving toward viewability based guarantees, so this mechanism for measurement and the impact of these calls will not be reduced until the implementation of this spec goes out in major webkit browsers(specifically Safari, mobile Safari, and embedded webviews).

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